Lap-joint for roofing or siding sheets.



No. 879,708. PATENTED FEB. 18, 1908.

E. G. WBLGH. I LAP JOINT FOR ROOFING 0R SIDING SHEETS.

APPLICATION FILED JAN.2 9,1907.

viz/5%. gjMM/? ELLSWORTH Gr. WELCH, OF NANKIN, OHIO.

LAP-JOINT FOR ROOFING OR SIDING SHEETS.

Specification of Letters Patent.

Patented Feb. 18, 1908.

Application filed January 29.1907. Serial No. 354.622

T 0 all whom it may concern:

Be it known that I, ELLSWORTH G. WELoH, a citizen of the United States, and a resident of Nankin, in the county of Ashland and State of Ohio, have invented certain new and useful Improvements in Lap-Joints for Roofing or Siding Sheets; and I do hereby declare that the following is a full, clear, and exact description ,of the invention, reference being had to the accompanying. drawings, which form apart of this s ecification.

This invention re ates to certain improvements in lap joints for sheet metal plates for use in covering roofs, sidings and thelike; and the objects and nature of my invention will be readily understood by those skilled in the art in the light of the following explanation of the structures shown in the accompanying drawings as the preferred embodiments of my invention from among other formations within the spirit and scope thereof.

An object of theinvention is to provide an exceedingly simple and efficient la joint for metal roofing or siding sheets whereby siphoning or creeping of Water through or over' the lap to the under surfaces of the sheets or to the sheathing covered by the sheets is prevented.

A further object of the invention is to pro- .vide certain improvements in the formation of the overlapping edges ofroofing or siding sheets for the purpose of preventing by simple means water creeping, siphoning or passmg by ca illary action from the outer to the inner sur aces of the sheets throu h the laps or joints between the edges'thereo The invention consists in certain novel features in construction and in formation and arrangements of parts as more fully and particularly set forth hereinafter.

Referring to the accompanying draw-' ings: Figure 1, is a perspective vlew 'of a air of corrugated sheets having their overapping edges formed in accordance with my invention. Fig. 2, is a perspective view of a portion of a V crimp roofing, showing a pair of sheets having their raised overlapping edges formed in accordance with my invention.

In'both the corrugated and V-orimp roofing or siding, the metal sheets are secured to j the backing or sheathing boards in any suitable manner or by any suitable means, and in both forms illustrated, the adjoining edges of thesheets are raised and overlap to formthe lap joint of the width from 3 to 2, and of height from 3 to'5 and 2 to 5.

In the form shown in Fig. 1', the Sheet 4, at one longitudinal edge portion terminates in an upward curve, bulge, convexity, or corrugation with adown turned free edge adapted to rest on the sheathing. This raised edge portion is thus formed with transversely and oppositely curved or downwardly inclined faces forming the inner or lower member of the lap or joint. The corresponding edge portion of sheet 1, forms the outer, exterior or top member of the lap or joint, and is curved, oonvexed or bulged outwardly to fit down on and engage the inner member from w 3 to 5, but the outer down-turned edge por-- tion of the outer member is of greater length than the corresponding portion of the inner member and is bent at a different angle or curvature therefrom so that its lower edge engages and rests on the outer surface of sheet 4, at 2, a distance beyond said bulged edge portion thereof, whereby the said corresponding inner and outer walls of the lap diverge and are spaced a sufficient distance apart from 5 to 2, to prevent water creeping by capillary or other action under the free edge of the outer sheet and up to the crown or top of the lap from 2 to 5, and without the formation of a concealed gutter on the inner sheet where water might collect and gradually creep over the la at 5.

The construction s own in Fig. 2, is practically the same as that shown in Fig. 1, and the same action takes place. By the action of gravity the water tends to flow outwardly under the free edge of the outer plate, and gravity will prevent such capillary action as would tend to cause the water to creep up from 2 to 5.

The lap joint described is exceedingly simple, and yet it accomplishes a most important result in preventing passage'of water by capillary or s iphonic action through the joint. i

What I claim is A lap' joint comprising inner. and outer overlapping sheets, the overlapping portions of the sheets being bulged outwardly to form theoppositely and inwardly inclined sides of the lap joint, the inner and outer sheets engaging on one side of the joint and spaced apart on the opposite side thereof to form the intervening space, substantially as described.

ELLSWORTH G. VVELCH.

Witnesses:

' WM. T. Devon,

T. M. HARKNESS. 

